Today, the company is expected to announce its first tablet,
which will be designed to compete with the iPad.

On Wednesday, we're expecting Microsoft to give us details on the
next major version of its Windows Phone operating, which will
likely be very similar to Windows 8.

Here's you need to know:

Microsoft will announce its own
tablet. This will be the first time Microsoft
builds the hardware and software for a tablet.

The tablet will run a special version of Windows 8
called "Windows RT." Windows RT is designed to
run on devices with ARM processors. Those are the same types of
processors found in smartphone and tablets (like the iPad)
today. Windows RT won't be able to run today's
traditional Windows apps, only apps from the Windows 8 app
store.

Microsoft may also announce a tablet that runs the full
version of Windows 8.
According to All Things D, there's a possibility Microsoft
will announce a tablet powered by processors that allow it to
run the full version of Windows 8. That means you'll be able to
access the Windows 7-like desktop mode and run older Windows
apps.

Microsoft may show off the next version of Windows
Phone on Wednesday. Microsoft recently sent out
invites to a developer event in San Francisco. We're guessing
this will be our first look at "Apollo," the next
operating system for Windows Phones. We know next to nothing
about Apollo other than it'll likely be very similar to Windows
RT for tablets.
It probably won't work on current Windows Phones like Nokia's
Lumia 900 either.